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Panda cubs play at the Chongqing Zoo in southwest China's Chongqing on Jan. 21, 2020. Four panda cubs named Shuangshuang, Chongchong and Xixi, Qingqing, together with the 37-year-old giant panda Xinxing, posed for a Chinese New Year greeting at the Chongqing Zoo. (Xinhua/Tang Yi)